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Douglas Stinson. Subtitled "Discrete Mathematics and Its Applications". Written with more emphasis on theory than practice, as acknowledged in the preface. Includes book information, select exercise answers, and supplemental notes.

Richard A. Mollin. Intended for a one-semester introductory undergraduate course in cryptography and covers symmetric and public key systems with chapters on advanced topics. Includes errata and brief overview.

Anderson, Explains how "pure" cryptography is not quite so pure when expressed in the context of real world applications. Includes sample chapters of the second edition, entire contents of the first edition in PDF and audio format, errata, and supplemental notes and links.